It's more surprise if one didn't realize a fact, this movie was in the freezer for more than 55 years, it only finally became a reality when Ms Jolie came on board, the studio and all involved have trusted her vision and all pieces finally came together with her dedication. She as the director and producer cast many unknown new actors for all the roles. For this movie,the director is more famous than any others involved, the media and many are interested in her and her involvement and the studio knows it. They know who is carrying the movie until it hit the big screen. THINK, if the studio use the new actors to promote the film now, not many but their small fan base will take notice of this movie, it will be more of the movie promoting the new actors...Even the hero Louis Zamperini and author of the book Laura Hillenbrand have much more fame than the new actors. Ms Jolie has huge fame is a fact and its internationally. Also as a director, she have much much more work to do and responsibility, way more than any of the actors than she chose to cast for this movie.